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Metal Detector

Discussion in 'Electronic Design' started by paul, Oct 28, 2003.

  1. paul

    paul Guest

    Does anyone have any experience with metal detector circuits ?

    I have a circuit for a BFO type detector but have read that this
    design is quite old and that 'pulse induction' designs are considered
    far better.

    I also have a design for a detector which uses a faraday shield on the
    coil. The design states this has to be constructed using 'tin' foil,
    and not 'aluminium foil'. Is this correct ?

    Any circuit ideas would be appreciated.

    Thanks

    Paul Smith
     
  2. I read in sci.electronics.design that paul <>
    Almost certainly not. Tin has a much higher resistivity than aluminium,
    so it just MIGHT be that the coil Q is OK with tin but not aluminium.
    You can solder to tin, of course, if you use a very cool soldering iron.
    But where could you get (and afford!) real tin foil these days?
     
  3. Tweetldee

    Tweetldee Guest

    Gary Lecomte has a pulse induction metal detector project at
    http://www3.telus.net/chemelec/Projects/Metal/Metal.htm. It appears to be a
    pretty solid design. I've started collecting the parts for the project, but
    haven't started building it yet.
    --
    Tweetldee
    Tweetldee at att dot net (Just subsitute the appropriate characters in the
    address)

    Never take a laxative and a sleeping pill at the same time!!
     
  4. Ian Stirling

    Ian Stirling Guest

    You can hammer out lead-free plumbing solder pretty easily.
     
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